They say that necessity is the mother of invention, and when the necessity is survival she can be one mean mother, but it's her child invention that's the real dangerous one.

Necessity... the mother of invention.

If necessity is the mother of invention, then dissatisfaction must be its father.

Necessity, they say, is the mother of invention, but fear, too, is not barren of ingenious suggestions.

Necessity may well be called the mother of invention but calamity is the test of integrity.

His eminence stressed two points: first, the importance of the Alliance, its survival and its unity, and second, the necessity of adhering to the decisions that came out of the Alliance.